Could not load assembly

.NET Core 2.1.4 on macOS

dotnet publish
dotnet fm validate versions --processor Postgres --assembly bin/Debug/netcoreapp2.0/api.dll --profile Debug --no-connection

Error

Unhandled Exception: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.EntityFrameworkCore, Version=2.0.1.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'. The system cannot find the file specified.

   at System.Reflection.RuntimeAssembly.GetExportedTypes(RuntimeAssembly assembly, ObjectHandleOnStack retTypes)
   at System.Reflection.RuntimeAssembly.GetExportedTypes()
   at System.Linq.Enumerable.<SelectManyIterator>d__167`3.MoveNext()
   at System.Linq.Enumerable.SelectEnumerableIterator`2.MoveNext()
   at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
   at System.Linq.Lookup`2.Create[TSource](IEnumerable`1 source, Func`2 keySelector, Func`2 elementSelector, IEqualityComparer`1 comparer)
   at System.Linq.GroupedEnumerable`3.GetEnumerator()
   at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable`1 source, Func`2 keySelector, Func`2 elementSelector, IEqualityComparer`1 comparer)
   at FluentMigrator.Runner.MaintenanceLoader..ctor(IAssemblyCollection assemblyCollection, IEnumerable`1 tags, IMigrationRunnerConventions conventions) in Z:\buildAgent\work\89282cfb76b17ca5\src\FluentMigrator.Runner\MaintenanceLoader.cs:line 37
   at FluentMigrator.Runner.MigrationRunner..ctor(IAssemblyCollection assemblies, IRunnerContext runnerContext, IMigrationProcessor processor, IVersionTableMetaData versionTableMetaData, IMigrationRunnerConventions migrationRunnerConventions) in Z:\buildAgent\work\89282cfb76b17ca5\src\FluentMigrator.Runner\MigrationRunner.cs:line 101
   at FluentMigrator.Runner.Initialization.TaskExecutor.Initialize() in Z:\buildAgent\work\89282cfb76b17ca5\src\FluentMigrator.Runner\Initialization\TaskExecutor.cs:line 85
   at FluentMigrator.Runner.Initialization.TaskExecutor.Execute() in Z:\buildAgent\work\89282cfb76b17ca5\src\FluentMigrator.Runner\Initialization\TaskExecutor.cs:line 90
   at FluentMigrator.DotNet.Cli.Commands.BaseCommand.ExecuteMigrations(MigratorOptions options, IConsole console)
   --- End of inner exception stack trace ---
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
   at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments)
   at McMaster.Extensions.CommandLineUtils.Conventions.ExecuteMethodConvention.Invoke(MethodInfo method, Object instance, Object[] arguments) in C:\projects\commandlineutils\src\CommandLineUtils\Conventions\ExecuteMethodConvention.cs:line 86
   at McMaster.Extensions.CommandLineUtils.Conventions.ExecuteMethodConvention.<OnExecute>d__1.MoveNext() in C:\projects\commandlineutils\src\CommandLineUtils\Conventions\ExecuteMethodConvention.cs:line 64
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at McMaster.Extensions.CommandLineUtils.Conventions.ExecuteMethodConvention.<>c__DisplayClass0_0.<<Apply>b__0>d.MoveNext() in C:\projects\commandlineutils\src\CommandLineUtils\Conventions\ExecuteMethodConvention.cs:line 25
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at McMaster.Extensions.CommandLineUtils.CommandLineApplication.<>c__DisplayClass126_0.<OnExecute>b__0() in C:\projects\commandlineutils\src\CommandLineUtils\CommandLineApplication.cs:line 505
   at McMaster.Extensions.CommandLineUtils.CommandLineApplication.Execute[TApp](CommandLineContext context) in C:\projects\commandlineutils\src\CommandLineUtils\CommandLineApplication.Execute.cs:line 31
   at FluentMigrator.DotNet.Cli.Program.Main(String[] args)

I’ve tried 2.0.5 and 2.0.7 of all FluentMigrator packages, no difference.

[zkbpkp]

@fubar-coder tried to do like in that example, now it works. Thanks again!

[fubar-coder]

It seems that you cannot use the dotnet-fm tool due to its restrictions. Some of those restrictions will be lifted as soon as the .NET Core global tools are available (and when we support it).

This problem isn’t easily solvable - especially on MacOS. The easiest solution would be to call the runner from within your application instead of using an external tool. You can find an example in this repository.

The runner itself contains several methods for up/down migrations and validation.